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3be03b13e5
%symbol-default instead of an empty symbol list, and start working on new per-type %destructor/%printer. Discussed at <http://lists.gnu.org/archive/html/bison-patches/2006-09/msg00007.html>. * NEWS (2.3+): Add %symbol-default to example. * bison.texinfo (Freeing Discarded Symbols): Likewise. (Bison Symbols): Add entry for %symbol-default. * src/parse-gram.y (PERCENT_SYMBOL_DEFAULT): New token. (generic_symlist, generic_symlist_item): New nonterminals for creating a list in which each item is a symbol, semantic type, or %symbol-default. (grammar_declaration): Use generic_symlist in %destructor and %printer declarations instead of symbols.1 or an empty list. (symbol_declaration, precedence_declaration, symbols.1): Update actions for changes to symbol_list. * src/reader.c: Update for changes to symbol_list. * src/scan-code.l: Likewise. * src/scan-gram.l: Scan new PERCENT_SYMBOL_DEFAULT token. * src/symlist.c, src/symlist.h: Extend such that a list node may represent a semantic type or a %symbol-default in addition to just an ordinary symbol. Add switched functions for setting %destructor's and %printer's. * tests/actions.at, tests/input.at: Add %symbol-default to all default %destructor/%printer declarations.
116 lines
3.8 KiB
C
116 lines
3.8 KiB
C
/* Lists of symbols for Bison
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Copyright (C) 2002, 2005, 2006 Free Software Foundation, Inc.
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This file is part of Bison, the GNU Compiler Compiler.
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Bison is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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Bison is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Bison; see the file COPYING. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#ifndef SYMLIST_H_
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# define SYMLIST_H_
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# include "location.h"
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# include "symtab.h"
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/* A list of symbols, used during the parsing to store the rules. */
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typedef struct symbol_list
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{
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/**
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* Whether this node contains a symbol, a semantic type, or a
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* \c \%symbol-default.
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*/
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enum { SYMLIST_SYMBOL, SYMLIST_TYPE, SYMLIST_DEFAULT } content_type;
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union {
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/** The symbol or \c NULL iff <tt>node_type = SYMLIST_SYMBOL</tt>. */
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symbol *sym;
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/** The semantic type iff <tt>node_type = SYMLIST_TYPE</tt>. */
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uniqstr type_name;
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} content;
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location location;
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/* If this symbol is the generated lhs for a midrule but this is the rule in
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whose rhs it appears, MIDRULE = a pointer to that midrule. */
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struct symbol_list *midrule;
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/* If this symbol is the generated lhs for a midrule and this is that
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midrule, MIDRULE_PARENT_RULE = a pointer to the rule in whose rhs it
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appears, and MIDRULE_PARENT_RHS_INDEX = its rhs index (1-origin) in the
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parent rule. */
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struct symbol_list *midrule_parent_rule;
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int midrule_parent_rhs_index;
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/* The action is attached to the LHS of a rule. */
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const char *action;
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location action_location;
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/* Whether this symbol's value is used in the current action. */
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bool used;
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/* Precedence/associativity. */
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symbol *ruleprec;
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int dprec;
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int merger;
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location merger_declaration_location;
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/* The list. */
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struct symbol_list *next;
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} symbol_list;
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/** Create a list containing \c sym at \c loc. */
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symbol_list *symbol_list_sym_new (symbol *sym, location loc);
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/** Create a list containing \c type_name at \c loc. */
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symbol_list *symbol_list_type_new (uniqstr type_name, location loc);
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/** Create a list containing a \c \%symbol-default at \c loc. */
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symbol_list *symbol_list_default_new (location loc);
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/** Print this list.
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\pre For every node \c n in the list, <tt>n->content_type =
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SYMLIST_SYMBOL</tt>. */
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void symbol_list_syms_print (const symbol_list *l, FILE *f);
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/** Prepend \c node to \c list. */
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symbol_list *symbol_list_prepend (symbol_list *list, symbol_list *node);
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/** Free \c list, but not the items it contains. */
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void symbol_list_free (symbol_list *list);
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/** Return the length of \c l. */
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int symbol_list_length (symbol_list const *l);
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/** Get item \c n in symbol list \c l. */
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symbol_list *symbol_list_n_get (symbol_list *l, int n);
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/* Get the data type (alternative in the union) of the value for
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symbol N in rule RULE. */
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uniqstr symbol_list_n_type_name_get (symbol_list *l, location loc, int n);
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/** The item \c n in symbol list \c l is \c used. */
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void symbol_list_n_used_set (symbol_list *l, int n, bool used);
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/** Set the \c \%destructor for \c node as \c destructor at \c loc. */
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void symbol_list_destructor_set (symbol_list *node, const char *destructor,
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location loc);
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/** Set the \c \%printer for \c node as \c printer at \c loc. */
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void symbol_list_printer_set (symbol_list *node, const char *printer,
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location loc);
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#endif /* !SYMLIST_H_ */
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